Alloy



Patented Feb.l6, 19 26 .5

UNITED STATES PA'l'E-NT OFFICE 2mm exam, on runs, amen, ASSIGNOR 'ro socm'rfi AnonYmE on oouiunmnx. rounoumnnuw & DECA'ZEVILLE, or PARIS, FRANCE.

ALLOY.

No Drawing.

; '84 Rue de Lille, Paris, Seine,-France, have application or as described herein; these 3 molybdenum, cobalt, vanadium and tita-.

invented new and useful Improvements in Alloys, which is fully set forth in the fol:

lowing specification. I

This invention has for object improvements in the alloy resisting oxidationwhich is described in my application filed Dec. 9, 1918, Ser. No. 265,985, primarily with a view of adapting the alloy to the particular conditions which are necessitated by manufacture on a large scale in a metallurgical appa ratus such as the Martin furnace. end the limiting content of carbon and manganese originally prescribed has been extended and according to this invention the carbon may -be carried to 1 per cent, and the manganese to 5 per cent.

Moreover, it has now been found, as the result of new experiments, that the alloy retains its specific properties when the llmiting content of nickel and chromium is more extended than that prescribed in the said ap plication. For the nickel the proportions fixed in the said application were to 70 per cent; by the present invention they may be 50 to 80 per cent; for the chromium, instead of 10 to 15 per cent, the proportions may be 8 to 25 per cent. Soalso, the proportions of tungsten and molybdenum.may be lowered respectively to 0.5 per cent and 0.2 er cent so as to increase notably the capacity for being forged, without. which the alloy ceases to possess the properties indicated. I

It has further been found that these alloys 'havea certain number of-industrial applications, whether made as described in the said have not been mentioned in the said application.

The alloy which is thebasis of the pres ent invention contains essentially iron, a.

high content of nickel, chromium, tungsten, manganese. It may include as accessories nium. It is easy to make in large uantities and is adapted tobe cast, forge rolled,

To this Application filed. December 9, 1920. Serial No. 429,544.

drawn and worked. 'The typical alloy comprises: 1

. Per cent.

, Nickel 50 to 80 Chromium 8 to 25 Tungsten 0.5 to 8 Manganese 1 to 5 Carbon 0.3 to 1 Iron The rest Example of composition: Ni: 65, Cr: 12, W: 1.5, Mn: 3, C: 0.5, iron: the rest.

. The maximum content for manganese and minimum and maximum for nickel and chromium are carried respectively to 5 per cent, 50 per cent, and 80 per cent, and 8 per cent,

and 25 per cent, in order to agree with the necessities of working, the yields and the nature of the added materials used in the Martin furnace. The presence of the manganese is-essential to ensure perfect homogeneity of the metal .as well as a satisfactory capacity for forging.

There are certain-modifications of composition. possible without bringing about important modifications of quality; thus for 0.5 to 8 per cent of tungsten may be substituted 0.2 to 5 per cent of molybdenum, or

these two metals may be'added together, sayto the extent of 0.2 to 8 per cent, of the total. This extension of content in tungsten and molybdenum over that indicated in the aforesaid application is owing to the experience that these metals are eflicient even in small proportion for imparting resistance to corrosion.

The properties may be further improved,

while facilitating the manufacture, by adding to the alloy above defined 0.2 to 1 per cent of vanadium, or 0.1 to 0.2 per cent of titanium, or 0.1 to 1 per cent of a mixture of vanadium and titanium. So also 0 to 10 per cent of cobalt may be added with a view.

of improving the mechanical strength of the alloy. The proportions of. the added elements indicated are added at. the cost of the content of iron.

The alloy in which have a mean value, such as the example indicated above, may have a tensile strength the various elements of to kilos per square mm. with an elastic limit of 20 to 30 kilos and a coefficient .of elongation 'of 40 percent at a temperature of 800 0., the values indicated in the aforesaid application, while being totally devoid of brittleness. When the content of tungsten or molybdenum or their mixture falls to the neighbourhood of'the lower limit indicated, the facility with which thcalloy can-be forged is notably.

increased, in the sense that this operation may be'performed, with less precaution and within the limits of temperature more extended; on the contrary, the fi ures indicated for the tensile strength an "the elastic limit at 800 0., while being incomparably higher than those of all steels or special alloys, are susceptible to a diminution of 5 to 10 kilos or square mm. respectively without sensi ly modifying the coefiicient of elongation.

i The following are industrial applicationsof the alloys forming the subject matter of the aforesaid application and .of' this invention: a

, Manufacture of apparatus used in chemical industry for synthetic reactions; in particular those used for the synthesis of ammonia (notably when these apparatus prising also rom 1 to 10 claves for synthesis, for chemical reactions,

at high temperatures, suc as or recuperation of'heat, burner nozzles, in-

jector nozzles ogerating in a su erheated surrounding, or ifiusing ,or liquids of corrosive km Having thus. described the nature of the said invention and the best means I know of carrying the same into practical effect, I-cl-aim: u

1. That alloy of iron, chromium, nickel, tungsten and manganesecomprising nickel to 80 percent, chromium 8 to 25 percent,

tungsten 0.5 to 8 percent, manganese 1 '5 percent, and carbon 0.3 to 1 percent.-

2. An allo as set forth in claim 1 comrcent of cobalt. have signed this PIERRE GIRIN.

' In testimony whereof specification.

gases. an VEPOHIS' 

